[HayZee518]

ok, to clarify, once you have the hose connected to the hot water system drain valve and have it open - and the curb stop CLOSED - open any valve on your system hot and cold. gravity will take over and will drain all lines. For a bathtub, unscrew the tub spout and get a 1/2 inch female coupling and adapt it to an airline fitting [probably be a 1/4 inch male thread] using a 1/2 X 1/4 inch bushing. start your compressor and adjust the output to 12 psi like the "pup" said when the line is blowing air with no sputtering, shut off the compressor and close the tub valve and go to the next fixture. for the sink spout you'll need an aerator adapter because this has a fine thread in/on it. adapt this to the compressor fitting and do the same as above. same will do with the kitchen sink spout. etc.